There isn't enough focus on that. I completely agree that those within the justice system need more training, prosecutors, police officers and the like.
The government should make training mandatory for them. You shouldn't be allowed to be a police officer if you can't recognize what constitutes domestic violence. You shouldn't be a prosecutor if you don't know the kind of trauma victims experience or how that trauma affects their testimony.
To me, that's self-evident, but there is a lack of awareness and education. It's the government's job to change that.